Restructuring - Summary of Accruals of Restructuring Programs (Details) - 2016 and 2017 Restructuring Program - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Restructuring Reserve [Roll Forward] | ||
| Restructuring reserve, beginning balance | $ 14,740 | $ 12,662 |
| Restructuring Charges | 601 | 16,677 |
| Adjustments | 2,057 | (69) |
| Restructuring Charges | 2,658 | 16,608 |
| Payments | (8,275) | (14,530) |
| Restructuring reserve, ending balance | 9,123 | 14,740 |
| Contractual Lease Obligations | ||
| Restructuring Reserve [Roll Forward] | ||
| Restructuring reserve, beginning balance | 12,437 | 10,583 |
| Restructuring Charges | 0 | 13,501 |
| Adjustments | 2,057 | (69) |
| Restructuring Charges | 2,057 | 13,432 |
| Payments | (6,022) | (11,578) |
| Restructuring reserve, ending balance | 8,472 | 12,437 |
| Severance | ||
| Restructuring Reserve [Roll Forward] | ||
| Restructuring reserve, beginning balance | 2,303 | 2,079 |
| Restructuring Charges | 601 | 3,176 |
| Adjustments | 0 | 0 |
| Restructuring Charges | 601 | 3,176 |
| Payments | (2,253) | (2,952) |
| Restructuring reserve, ending balance | $ 651 | $ 2,303 |